So I met this nice girl through an internet dating site, the first date was great, and we ended up kissing halfway through the date and at the end of it. I tried to set up a second date, but she claimed she was busy. On the second attempt I called her up on her obviously bullshit excuse, and simply forgot about her, as she didn't reply to my text. Now three weeks later she sends me an email, claiming she realised after meeting me that she isn't ready for a relationship. I don't know... If she'd sent that email immediately, it'd obviously be because she wasn't really attracted to me, but sending one weeks later after no contact in between... maybe she's trying to get back into contact, and it isn't a lost cause after all. What do you think?

Don't read into it. Move on.

If you're not looking for a relationship either, and just a hookup/friend/etc., then let her know. It may be she just doesn't want any pressure. Either way, after you've sent you're message, don't think about it anymore. Move on, and if she responds back, cool, if not, who cares, because you have other girls you're talking to, too.